| 摘要 |
An aerodynamic device comprising an aerofoil 1 having a leading 2 and trailing 3 edge and one or more protruding 4 aerodynamic surfaces positioned upon the fluid accelerating surface. The protrusions which have a symmetrical shape about the chordal line of the aerofoil 1 are characterised by a convex arcuate portion 5 towards the leading edge and a flatter tail portion 6 towards the trailing edge. The protrusions 4 may have a surface 7 parallel to the fluid accelerating surface, a height consistent with the fluid boundary layer, a maximum width at the arcuate portion located about one third from the vertex nearest the leading edge 2, and be variable in chord length. The protrusions may be fixed or movable, and may extend/retract into the fluid stream in combination with flaps or slats. Protrusions 4 may be equi-spaced along the span of the aerofoil and at the aerofoil ends. The aerofoil may have an angle of attack greater than 13 degrees, and may be used on aircraft, propeller, windmill, watermill, helicopter, boat, or turbine applications.
|
